: A critical section of the schematic is the DC-DC step-up module or high-voltage transformer, which converts low voltage (like 12V DC) to the 300V–2000V range required for the CRT anodes.
Many designs, like those found on Sgitheach or TubeClockDB , use software to rotate between analog and digital faces to distribute phosphor wear. The Philosophy of Timekeeping Crt Clock Schematic
